Also found in: Dictionary, Thesaurus, Acronyms, Encyclopedia, Wikipedia.
Related to psoas: psoas minor, Psoas sign
pso·as ma·jor (mus·cle)[TA]
groin muscle; origin, bodies of vertebrae and intervertebral discs from the twelfth thoracic to the fifth lumbar, and transverse processes of the lumbar vertebrae; insertion, forms a common insertion with iliacus muscle into lesser trochanter of femur; action, primary flexor of hip joint; nerve supply, lumbar plexus (ventral rami of first, second and usually third lumbar spinal nerves).
1. The larger of two muscles that originate in the lower spine. This muscle flexes the hip. Also called psoas major.
2. The smaller of two muscles that originate in the lower spine. This muscle flexes the lower spine. Also called psoas minor.
psoas(sō′ăs) [Gr. psoa]
One of two muscles of the loins, psoas major and psoas minor.
a sublumbar muscle. See Table 13.
on the ventral border of the shaft of the ilium; attachment point for the psoas minor muscle.